Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Where Antarctic Predatory Seabirds Overwinter

02.12.2011
Polar-Ornithologists of Jena University explain flight routes of skuas with international team

When it comes to choosing their wintering destinations Antarctic skuas are flexible. This is shown in a study of an international research team led by the polar-ornithologist Dr. Hans-Ulrich Peter from the Friedrich Schiller University Jena (Germany). According to the study, a great part of the South Polar skuas spend the Antarctic winter in the Northern Atlantic. At the same time about one third of the same species overwinters in the Northern Pacific, tens of thousands of miles away.


South Polar skua with geolocator (right leg).
Photo: Matthias Kopp/FSU

In order to identify the flight routes of the birds, postgraduate Matthias Kopp, under the guidance of Dr. Peter, equipped South Polar skuas with geolocators in their breeding areas on King George Island, about 120 kilometers off the Antarctic Mainland. Thus he has been screening their position data over a period of several years, followed by an analysis together with British colleagues and a scientist from Switzerland. “With the help of these data we can now for the first time definitely say that the South Polar skuas are not overwintering, like their close relatives, the brown skuas, off the Argentine coast but mainly in the northern hemisphere”, explains the head of research, Dr. Peter. So far the scientists could only speculate about where the birds overwinter and which routes they are heading for. “The observation of single birds led us to the assumption that they overwinter in the Atlantic. But so far it wasn’t known that a great part of them stay as well in the middle of the Northern Pacific in the winter”, says the Jena scientist who has been researching in Antarctica since 1983 on a regular basis.

No matter, which ocean the birds are heading towards for overwintering, their flight routes show remarkable similarities. Thus the flight routes from the north and the return travel to the south are always shaped like a slip knot crossing on the equator. On both flights together the birds showed a big figure-of-eight flight pattern. At first the skuas which are overwintering in the Atlantic fly on a wide corridor northwards along the east coast of South America, and then change direction after having passed the equator and head towards the northwest. At the end of May they arrive at their destination in the Northern Atlantic. In the three months they spent on the open sea they wander along with the wind and the ocean current for more than 1,000 kilometers in a eastward direction, before they start their return flight in end-August. Before arriving at their breeding sites on King George Island they have a stop-over. For up to three weeks the birds are resting off the Patagonian coast and refill their body reserves.

The flight route into the North Pacific leads at first along the coast of South America and then changes direction towards the northwest above the equator. In mid-May, two weeks earlier than their conspecifics overwintering in the Atlantic, the skuas arrive at their winter quarters in the Pacific. These animals too, let themselves drift along with the wind and the waves up to 3,000 kilometers eastwards. Their way back leads them in a wide curve in a southwestern direction towards New Zealand and finally turns in a southeasterly direction into Antarctica. There, they are resting for a few days as well before they return to their breeding site. “We think that the animals need this resting phase to recover from the strain of the long trip through the tropics where food is scarce”, Dr. Peter says.

Once the skuas have decided on an ocean for a winter quarter, they will head towards the same destination in the following years as well. Until now the scientists didn’t know the ultimate reason for the animals’ decision on one particular direction. ”We know for sure though that the animals get their own bearings and don’t learn the route from their parents”, Dr. Peter says. And so for him and his colleagues some questions still remain unanswered. Therefore the Jena scientist will leave for a research trip to Antarctica this year – 100 years after Roald Amundsen, the first person ever to reach the South Pole. Two of Dr. Peter’s students are already on site and have captured the first Skuas. For Hans-Ulrich Peter it is he 22th expedition to the world’s most southern continent.

Contact:
Dr. Hans-Ulrich Peter
Institute of Ecology
Friedrich Schiller University Jena
Dornburger Str. 159, D-07743 Jena, Germany
phone: ++49 3641 949415
email: Hans-Ulrich.Peter[at]uni-jena.de

Dr. Ute Schönfelder | idw
Further information:
http://www.uni-jena.de/

More articles from Life Sciences:

nachricht Discovery of a Key Regulatory Gene in Cardiac Valve Formation
24.05.2017 | Universität Basel

nachricht Carcinogenic soot particles from GDI engines
24.05.2017 | Empa - Eidgenössische Materialprüfungs- und Forschungsanstalt

All articles from Life Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: A quantum walk of photons

Physicists from the University of Würzburg are capable of generating identical looking single light particles at the push of a button. Two new studies now demonstrate the potential this method holds.

The quantum computer has fuelled the imagination of scientists for decades: It is based on fundamentally different phenomena than a conventional computer....

Im Focus: Turmoil in sluggish electrons’ existence

An international team of physicists has monitored the scattering behaviour of electrons in a non-conducting material in real-time. Their insights could be beneficial for radiotherapy.

We can refer to electrons in non-conducting materials as ‘sluggish’. Typically, they remain fixed in a location, deep inside an atomic composite. It is hence...

Im Focus: Wafer-thin Magnetic Materials Developed for Future Quantum Technologies

Two-dimensional magnetic structures are regarded as a promising material for new types of data storage, since the magnetic properties of individual molecular building blocks can be investigated and modified. For the first time, researchers have now produced a wafer-thin ferrimagnet, in which molecules with different magnetic centers arrange themselves on a gold surface to form a checkerboard pattern. Scientists at the Swiss Nanoscience Institute at the University of Basel and the Paul Scherrer Institute published their findings in the journal Nature Communications.

Ferrimagnets are composed of two centers which are magnetized at different strengths and point in opposing directions. Two-dimensional, quasi-flat ferrimagnets...

Im Focus: World's thinnest hologram paves path to new 3-D world

Nano-hologram paves way for integration of 3-D holography into everyday electronics

An Australian-Chinese research team has created the world's thinnest hologram, paving the way towards the integration of 3D holography into everyday...

Im Focus: Using graphene to create quantum bits

In the race to produce a quantum computer, a number of projects are seeking a way to create quantum bits -- or qubits -- that are stable, meaning they are not much affected by changes in their environment. This normally needs highly nonlinear non-dissipative elements capable of functioning at very low temperatures.

In pursuit of this goal, researchers at EPFL's Laboratory of Photonics and Quantum Measurements LPQM (STI/SB), have investigated a nonlinear graphene-based...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

AWK Aachen Machine Tool Colloquium 2017: Internet of Production for Agile Enterprises

23.05.2017 | Event News

Dortmund MST Conference presents Individualized Healthcare Solutions with micro and nanotechnology

22.05.2017 | Event News

Innovation 4.0: Shaping a humane fourth industrial revolution

17.05.2017 | Event News

 
Latest News

Devils Hole: Ancient Traces of Climate History

24.05.2017 | Earth Sciences

Discovery of a Key Regulatory Gene in Cardiac Valve Formation

24.05.2017 | Life Sciences

A CLOUD of possibilities: Finding new therapies by combining drugs

24.05.2017 | Life Sciences

VideoLinks
B2B-VideoLinks
More VideoLinks >>>